US7742533B2 - OFDM signal transmission method and apparatus - Google Patents
OFDM signal transmission method and apparatus Download PDFInfo
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- US7742533B2 US7742533B2 US11/076,051 US7605105A US7742533B2 US 7742533 B2 US7742533 B2 US 7742533B2 US 7605105 A US7605105 A US 7605105A US 7742533 B2 US7742533 B2 US 7742533B2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
- H04L27/2611—Distribution thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/10—Polarisation diversity; Directional diversity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
- H04J11/0026—Interference mitigation or co-ordination of multi-user interference
- H04J11/0036—Interference mitigation or co-ordination of multi-user interference at the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; Arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
- H04L25/0226—Channel estimation using sounding signals sounding signals per se
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
- H04L27/2613—Structure of the reference signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0023—Time-frequency-space
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/02—Channels characterised by the type of signal
- H04L5/023—Multiplexing of multicarrier modulation signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. van Duuren system ; ARQ protocols
- H04L1/1829—Arrangements specific to the receiver end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
Abstract
Description
where TXa and TXb are transmission signals from the transmission antennas 101 a and 101 b, respectively. When the reception signals RXa and RXb are multiplied by the inverse matrix of the matrix formed by the channel response values Haa, Hab, Hba, and Hbb, the transmission signals TXa and TXb can be demodulated.
Pa(i, j)=PN(i)×Sa(j) (2)
where i is the symbol number in the time domain, and j is the pilot subcarrier number in the frequency domain. Similarly, a baseband signal Pb(i,j) of the pilot subcarriers from the transmission antenna 101 b is expressed by the product of PN(i) and Sb(j), which is given by
Pb(i, j)=PN(i)×Sb(j) (3)
Sa(1)=1, Sa(2)=1, Sa(3)=1, Sa(4)=−1 (4)
Sb(1)=1, Sb(2)=−1, Sb(3)=1, Sa(4)=1 (5)
Sb(1)=1, Sb(2)=1, Sb(3)=1, Sb(4)=−1 (7)
s(1)=[1, 1, 1, 1]
s(2)=[1, −1, −1, 1]
s(3)=[1, 1, −1,−1]
s(4)=[−1, 1, −1, 1] (8)
where sk(i) is the polarity of the pilot subcarrier, j is the imaginary unit, i is the number of the pilot subcarrier, and k is the antenna number of the transmission antenna. For example, the first element of k represents the signal transmitted from the transmission antenna 101 a, and the second element of k represents the signal transmitted from the transmission antenna 101 b.
[S k(1), S k(2), S k(3), S k(4)]=[s k(1), s k(2), s k(3), −s k(4)] (10)
where sk(i) is the polarity of the pilot subcarrier, j is the imaginary unit, i is the frequency of the pilot subcarrier, k is the antenna number of the transmission antenna, and N is the number of input points in inverse Fourier transform.
Pa(i, j)=PNa(i)×S(j) (15)
Pb(i, j)=PNb(i)×S(j) (16)
Pa(i, j)=PNa(i)×Sa(j) (17)
Pb(i, j)=PNb(i)×Sb(j) (18)
Pa(2i−1, j)=PN(2i−1) (19)
Pa(2i, j)=−PN(2i)* (20)
Pb(2i−1, j)=PN(2i) (21)
Pb(2i, j)=−PN(2i−1) (22)
where * is the complex conjugate. As indicated by equations (19) to (22), the PN sequences are transmitted by using transmission diversity using two transmission antennas 101 a and 101 b and two symbols. The transmission diversity method represented by equations (19) to (22) is the same as that disclosed in U.S. Pat. No. 6,185,258B1.
Pa(2i−1, j)=PN(2i (23)
Pa(2i, j)=−PN(2i−1) (24)
Pb(2i−1, j)=PN(2i−1) (25)
Pb(2i, j)=−PN(2i)* (26)
Matrix Q′P given by
where Sppos(i,t),k,t indicates that the (Sppos(i,t))th subcarrier is used as a pilot subcarrier, k is the transmission antenna number, and t is the OFDM symbol number. In equation (27), the right-hand member of equation (9) is multiplied by polarity data Prot(i,t) given by
where Ppos(i,t) is a conversion function to convert the subcarrier number from the pilot subcarrier number i and OFDM symbol number t. More specifically, Ppos(i,t) can be expressed by
r DATA1 =H aa +H ba +H ca +H da (30)
r DATA2=(H aa +jH ba −H ca −jH da)exp(jθ) (31)
r DATA3=(H aa −H ba +H ca −H da)exp(j2θ) (32)
r DATA4=(H aa −jH ba −H ca +jH da)exp(j3θ) (33)
These are signals before the residual phase error is removed, and exp(jnθ) (n=1, 2, 3) represents the residual phase error. The channel estimation value of Haa can be obtained by executing processing given by
Ĥ ba =r DATA1 −jr DATA2 −r DATA3 +jr DATA4 (35)
Claims (13)
Priority Applications (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004071732 | 2004-03-12 | ||
JP2004-071732 | 2004-03-12 | ||
JP2004176096A JP4237680B2 (en) | 2004-03-12 | 2004-06-14 | OFDM signal transmitter |
JP2004-176096 | 2004-06-14 | ||
JP2004-235349 | 2004-08-12 | ||
JP2004235349A JP4088281B2 (en) | 2004-08-12 | 2004-08-12 | OFDM signal transmitting method and OFDM signal transmitting apparatus |
JP2004256247A JP4327684B2 (en) | 2004-09-02 | 2004-09-02 | OFDM signal transmitting method and OFDM signal transmitting apparatus |
JP2004-256247 | 2004-09-02 | ||
JP2005052949A JP4405411B2 (en) | 2005-02-28 | 2005-02-28 | OFDM signal transmitter |
JP2005-052949 | 2005-02-28 |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
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US12/418,002 US7782969B2 (en) | 2004-03-12 | 2009-04-03 | OFDM signal transmission method and apparatus |
US12/604,712 US8107556B2 (en) | 2004-03-12 | 2009-10-23 | OFDM signal transmission method and apparatus |
US13/299,760 US8867663B2 (en) | 2004-03-12 | 2011-11-18 | OFDM signal transmission method and apparatus |
US14/482,763 US9300385B2 (en) | 2004-03-12 | 2014-09-10 | OFDM signal transmission method and apparatus |
US15/047,329 US9923744B2 (en) | 2004-03-12 | 2016-02-18 | OFDM signal transmission method and apparatus |
US15/397,476 US10243771B2 (en) | 2004-03-12 | 2017-01-03 | OFDM signal transmission method and apparatus |
Related Child Applications (2)
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US12/418,002 Continuation US7782969B2 (en) | 2004-03-12 | 2009-04-03 | OFDM signal transmission method and apparatus |
US12/604,712 Continuation US8107556B2 (en) | 2004-03-12 | 2009-10-23 | OFDM signal transmission method and apparatus |
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US20050201268A1 US20050201268A1 (en) | 2005-09-15 |
US7742533B2 true US7742533B2 (en) | 2010-06-22 |
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US11/076,051 Active 2029-01-13 US7742533B2 (en) | 2004-03-12 | 2005-03-10 | OFDM signal transmission method and apparatus |
US12/418,002 Active US7782969B2 (en) | 2004-03-12 | 2009-04-03 | OFDM signal transmission method and apparatus |
US12/604,712 Active US8107556B2 (en) | 2004-03-12 | 2009-10-23 | OFDM signal transmission method and apparatus |
US13/299,760 Active 2025-09-25 US8867663B2 (en) | 2004-03-12 | 2011-11-18 | OFDM signal transmission method and apparatus |
US14/482,763 Active US9300385B2 (en) | 2004-03-12 | 2014-09-10 | OFDM signal transmission method and apparatus |
US15/047,329 Active 2025-08-06 US9923744B2 (en) | 2004-03-12 | 2016-02-18 | OFDM signal transmission method and apparatus |
US15/397,476 Active 2025-09-06 US10243771B2 (en) | 2004-03-12 | 2017-01-03 | OFDM signal transmission method and apparatus |
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US12/418,002 Active US7782969B2 (en) | 2004-03-12 | 2009-04-03 | OFDM signal transmission method and apparatus |
US12/604,712 Active US8107556B2 (en) | 2004-03-12 | 2009-10-23 | OFDM signal transmission method and apparatus |
US13/299,760 Active 2025-09-25 US8867663B2 (en) | 2004-03-12 | 2011-11-18 | OFDM signal transmission method and apparatus |
US14/482,763 Active US9300385B2 (en) | 2004-03-12 | 2014-09-10 | OFDM signal transmission method and apparatus |
US15/047,329 Active 2025-08-06 US9923744B2 (en) | 2004-03-12 | 2016-02-18 | OFDM signal transmission method and apparatus |
US15/397,476 Active 2025-09-06 US10243771B2 (en) | 2004-03-12 | 2017-01-03 | OFDM signal transmission method and apparatus |
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EP (2) | EP3190761A1 (en) |
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US9923744B2 (en) | 2018-03-20 |
EP1575235B1 (en) | 2020-10-07 |
US7782969B2 (en) | 2010-08-24 |
US20170118056A1 (en) | 2017-04-27 |
EP3190761A1 (en) | 2017-07-12 |
EP1575235A3 (en) | 2012-05-16 |
US20050201268A1 (en) | 2005-09-15 |
US10243771B2 (en) | 2019-03-26 |
US20100040167A1 (en) | 2010-02-18 |
US9300385B2 (en) | 2016-03-29 |
EP1575235A2 (en) | 2005-09-14 |
US8867663B2 (en) | 2014-10-21 |
US20090225885A1 (en) | 2009-09-10 |
US20120063540A1 (en) | 2012-03-15 |
US20140376672A1 (en) | 2014-12-25 |
US20160164707A1 (en) | 2016-06-09 |
US8107556B2 (en) | 2012-01-31 |
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